Craft Stick Catapult - I made 4 of these in 5 minutes and they work great! You need craft sticks, 4 rubber bands, hot glue or tape, and a bottle cap (I cut apart an egg carton because I didn't have any bottle caps).
Learn the proper use and benefit of a walking stick. Train in staff weapon defense. When attaching tools and modifications to the stick be sure to have duplicates in the rucksack in case I lose the stick.